Electric heater.



PATENT@ FEB. zo, 1906 A'. A. PRATT. ELEG TRS HEATER.' APPLIGATION FILED JUNE 21,1905.

2 SHEETS-SHEET 1.

vll n Witnesses '.7

No. 813,113. y EA'EENTEEEEE. 2o, 1906. 11.11. EEATT, ELECTRIC HEATER.

APPLICATION FILED JUNE'Zl, 1905.

2 SHEETS-SHEET 2- JW f Attorneys Witnesses I Inventor f7 7 -f .by

' construction for AUSTIN A.` PRATT, OF LOS ANGELES, UALIFO'RNlA.

ELECTRIC HEATER.;

No. sis-,113.

Speccaton of Letters Patent. Application filed June 21, 1905. Serial No. 266,313l

5311512551 Een. 2o, 190s.

To all whom, t m/aycmwernf:

Be it known that I, AUSTIN A. PRATT-, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented anew and nsetul Electric Heater, of which .the following 1s a specification.

This invention relates to electric heating apparatus, and has for its principal object to provide a device of simple and economical y heating apartments or for the heating of small quantities of liquid for medicinal or other purposes.

A further object of the invention is to provide a heating device which may be operated at minimum expense and without any odor whatever, all insulating or heatabsorbing material of a character which emits oiiensive odors when heating being eliminated.

A still further object of the invention is to provide a light and readily-portable heater which may be moved from place to place and 1n which a current of air is induced by providin an inletat the bottom of the heatero casing and an outlet at the top thereof, the

area of the outlet-openings being somewhat less than the area of the inlet, so that the yilow will be checked to a suil'icient extent to permit thorough heating of the air as it passes through the easing.

With these and other objects in view, as

f will more fully hereinafter appear, the invention consists in the novel construction and arrangement of lparts hereinafter fully described, illustrated in the accompanying drawings, and particularly pointed out in the lappended claims,it being understood that various changes in the form, proportions, size,and minor details of the structure may bemade without departing from the spirit or sacrificing any of the advantages of the invention. v

' Figure 1 is a vertical sectional view of an electric heater constructedl in accordance with the present invention. Fig. 2 is a sectional plan view of the same on the line 2 2 of Fig. 1. Fig. 3 is a transverse sectional view on he line 3 3 of Fig. l looking toward the top of the heater. Fig. 4 is a detail perspective view of one of the insulating blocks. Fig. 5 is a similar view of one of the coil-connecting conductors carried by said blocks. Fig. 6 is a detail perspective view of a portion of the detachable handle for carrying the 1heater from place to place.

Similar characters of reference indicat corresponding parts in each of the several figures.

l The frame of the heater comprises upper and lower rings 1() and 11, that are rigidly connected together b v a plurality of equidistantly-spaced vertical rods 12, the upper and lower ends of which are threaded and extend through openings Jformed in the rings. The upper ring is clamped in position by nuts 13, carried by the rod,while the lower end oi the rodpasses also through a block 14, formed of porcelain or similar material, the block and ring being held in proper position by suitable clamping-nuts 15 on the threaded lower portion ot the rod. These lower blocks constitute supports for the connecting devices at the lower ends of the coils. Secured to the upper ring are a number of porcelain blocks 1.5,hcld in place by suitable bolts 16, and these form supports for the connecting devices at the upper ends'oi the coils. The several coils 17 are preferably formed oi' German silver or other material of high resistance and extend in vertical or approximately vertical lines between the upper and lower connect-ing devices. Each of the porcelain blocks is provided with an annular groove 19 for the reception of a connecting device in the form of a pair ot plates 20, the central portions of which are approximately semicircular and are provided at their outer ends with openings for the passage of onnectingscrews 21', which also serve to lock the ends of the coils to the strips. The upper ring is provided in the present instance with five porcelain blocks 15, while the lower ring is provided with six oi' said blocks, two of the blocks being arranged closely together, as shown in Fig. 2, and being provided with specially-formed connecting-strips 20, the inner ends of which are extended beyond the inner edge of the lower ring and are adapted to receive the ends of the current-conducting wires 121. The current-conductors 21 may lead from an ordinary lamp -socket plug a, as shown in Fig` 2, the wires being led up through 'a central opening formed in a reticulated disk 25, that is disposed below the lowermost ring.

The several resistance-coils are connected in a continuous series leading from one of the connecting-strips 20 to the other, and the coils are arranged in a continuous annular series a volume of air passing upward will be IOO thoroughl)Y heated. rllhe resistance-eoils and their supports are contained within a suitable Casing 2h, which in the present instance is connected to the coil-supports b v means ot clips 2T, that are held in place bv the lower ends olE three oll the vertical bolts 1'. and are provided with opeiiings for the passage ol seciuing-screws, that extend also through the casing. These clips 27 have inbent lower ends, as shown b v dotted lines in Fig. l, tor the support ot` the reticulated screen 25. rl`he casing is supported bv a number olI legs or standards at a convenient height from the lloor or other surface, and the upper portion ot the casing is beaded, as at 3l), For the reception oi the opposite ends oi a springhandle 3l, which may' be employed to carr \v the heater from place to place and which ma)Y be quickly adjusted to or removed trom position. The top ot the casing ma)v be in the form oi a solid cap, but preterabhv is provided with a centrally-disposed removable cover I] having openings for the passage ot' Lne h ated air, and the combinedarcas of the several openings are less than the areaot the inlet at the bottom ol the casing, so that passage ot air through said casing will be retarded to an extent sutlicient to permit the 4volume of air to be thoroughly heated before it is discharged. By removing the upper cap member $1 a watervessel or thelike maybe placed in position for the purpose of heating small quantities of water or other liquid.

It will be noted that the insulating devices are termed of porcelain or a similar material and that the remaining portions of the heater are wholly of metal all insulating or heat-absorbing material having a tendenc)T to emit odors when heated being eliminated.

The construction is such that in the event of rupture ot' anbv one of the coils it may be qaickl)v replaced, and the construction ofthe whole is much more economical than is usual in heating devices of this class.

Having thus described the invention. what is claimed is` 1. In an electric heater, a casing, a pair of supporting members arranged therein, insulating-blocks carried bv said members, conducting-clips supported bythe. blocks, and a pluralit)Y ot' series-connected resistance-coils extending between said clips.

2. ln an electric heater, a. asing, upper and lower supports disposed therein, insulating-blocks on said supports, metallic clips carrried b v the insulating-blocks, resistai'lc-ecoils connected in a continuous series b v said clips, and means l'or connecting the coils to the clips and for clampingthe lattci' in position on the blocks.

l i i l l l l l l l l i l l i 3. in an electric heater. a. easing. a pair ot' trame-rings arranged within the casing, connecting-bolts extending between the rings, msulating-blocks held in place on the lower ring by means oir said bolts. a series` oll insu lating-blocls secured to the upper ring. the blocks olE the resl'iec-tive rings being disposed in staggered, relation. current-conducting strips clamped on the blocks, and resistancecoils connected in series b v said strips.

t. ln an electric heater, a casing, upper and lower frame-rings arranged therein, insubiting-blocks carried b v the upper and lower rings, the blocks of the respective rings being disposed in staggered relation, each ot' said blocks having a peripheral groove. strips of conducting material arranged within the grooves and clampedin place, and resistancecoils connected in a continuous series bv said strips.

In an electric heater, the combination with a casing, of upper and lower rings. insulating-blocks carried by the rings and provided with grooves, insulating-strips arranged in said grooves, resistance-coils con nected in a continuous series b v said strips, two of the strips being extended inward over the edge of the lower ring l'or connection lo current-conducting wires.

6. In an electric heater, a casing, upper and lower trame-rings arranged therein. connecting-bolts extending between the rings, clips secured to the lower ring, means oi' securing the casing to the clips, a reticulated disk supported by the clips at a point below the lower ring, and a perforated cover i'orming the top of the easing.

7. In an electric heater, the combil'iation with upper and lower frame-rings, ot" a pluralit;Y oli vertical bolts connecting the rings, insulating-blocks carried bv the rings. eurrent-comlucting strips supported bv the blocks, resistancewoiis connected to said strips. a casing surrounding the trame and having a detachable perforated cap to permit the insertion ol a vessel within the easing.

thin a device ot the 'class specified, the combination with a' casing, of a` pair of superposed and spaced supports, insulators carried thereby, and a pluralitvof resistancecoils extending between the insulators and arranged in a continuous annularseries, forming a central passage for the air to be heated.

In testimonyv that I claim the foregoing as mv own i have hereto affixed my signature in the presence of two witnesses.y

AUSTIN A. PRATT,

litnessesz CARL A. S'rursimx, lCnwARD W. Foam'.

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